31368613536 has 72 divisors (see below), whose sum is σ = 96066390420. Its totient is φ = 9651879936.

The previous prime is 31368613519. The next prime is 31368613543. The reversal of 31368613536 is 63531686313.

31368613536 is a `hidden beast` number, since 3 + 1 + 36 + 86 + 1 + 3 + 536 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23722160400 + 7646453136 = 154020^2 + 87444^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 31368613491 and 31368613500.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4185441 + ... + 4192928.

Almost surely, 2^31368613536 is an apocalyptic number.

31368613536 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31368613536 is an abundant number, since it is smaller than the sum of its proper divisors (64697776884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31368613536 is a wasteful number, since it uses less digits than its factorization.

31368613536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8378398 (or 8378387 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The spelling of 31368613536 in words is "thirty-one billion, three hundred sixty-eight million, six hundred thirteen thousand, five hundred thirty-six".